Grid Width

wxPython Users
1

Is there a way to determine the width needed to display a grid without a
horizontal scrollbar even when a vertical scrollbar is displayed.

I added a grid to a vertical box sizer on a frame. The grid is the
widest thing on the frame. As long as there is no vertical scrollbar,
the entire grid is displayed. However, if I reduce the height of the
frame so that a vertical scrollbar is needed for the grid, the width of
the vertical scrollbar reduces the width of the grid and a horizontal
scrollbar is displayed.

Is there a way to determine the width of a vertical scrollbar or the
height of a horizontal scrollbar. I believe they are different sizes
depending on the operating system and perhaps display themes.

When the above grid is displayed (under GTK, at least), there are a few
pixels of background color to the left and bottom of the grid. If I
resize the frame to eliminate those, the scrollbars return. Is there a
way to have the bottom and right edges of the grid exactly at the edge
of the grid, except for space for an undisplayed vertical scrollbar.

2

Obviously, both the vertical and the horizontal scrollbars occupy some pixels, and as you wrote their sizes depend on OS and display themes. You have to choose: either you accept that one of the columns is of variable width, or the whole grid, hence the frame are of variable size. You need a method that, gauging the difference between grid.GetSize() and grid.GetClientSize(), checks the number of pixels necessary to show exactly all the columns. This is the code I wrote for my grids:
quote
def SetOptimalSize(grid):
# Resets the grid width to show exactly all columns
GridWidth = 0
for c in range(grid.GetNumberCols() ):
GridWidth += grid.GetColSize(c)
sz = grid.GetSize()
csz = grid.GetClientSize()
delta = sz.width

  • csz.width + 10 # (I don’t know why, but it seems necessary)
    GridWidth += (delta + grid.GetRowLabelSize())
    GridHeight = grid.GetColLabelSize() +
    grid.GetDefaultRowSize() * grid.VisibleRows

  • 7 # (idem)

      szp =  grid.GetParent().GetClientSize()
  if szp.width < GridWidth:
      szp.SetWidth(GridWidth)
      grid.GetParent().SetClientSize(szp)
     
  grid.SetSize((GridWidth, GridHeight))
  szParent = grid.GetParent().GetClientSize()
  if szParent.width < (GridWidth + 10):
      szParent.width = (GridWidth + 10)
      grid.GetParent

().SetClientSize(szParent)
unquote

and I called this method in:
grid.init
grid.EndBatch
grid.OnEVT_GRID_ROW_SIZE
grid.SetColAttr
grid.SetRowAttr
grid.SetColSize
grid.SetRowSize
grid.SetNumberCols

grid.SetNumberRows
and all variants of grid.Autosize

Sorry, I didn’t say it was simple, but it works.
Cheers

···

2008/1/2, Mark Erbaugh < mark@microenh.com>:

Is there a way to determine the width needed to display a grid without a

horizontal scrollbar even when a vertical scrollbar is displayed.

I added a grid to a vertical box sizer on a frame. The grid is the
widest thing on the frame. As long as there is no vertical scrollbar,

the entire grid is displayed. However, if I reduce the height of the
frame so that a vertical scrollbar is needed for the grid, the width of
the vertical scrollbar reduces the width of the grid and a horizontal

scrollbar is displayed.

Is there a way to determine the width of a vertical scrollbar or the
height of a horizontal scrollbar. I believe they are different sizes
depending on the operating system and perhaps display themes.

When the above grid is displayed (under GTK, at least), there are a few
pixels of background color to the left and bottom of the grid. If I
resize the frame to eliminate those, the scrollbars return. Is there a

way to have the bottom and right edges of the grid exactly at the edge
of the grid, except for space for an undisplayed vertical scrollbar.

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3

Mark Erbaugh wrote:

Is there a way to determine the width of a vertical scrollbar or the
height of a horizontal scrollbar. I believe they are different sizes
depending on the operating system and perhaps display themes.

wx.SystemSettings.GetMetric

···

--
Robin Dunn
Software Craftsman
http://wxPython.org Java give you jitters? Relax with wxPython!